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'Shortly before 1.45pm today police at Buckingham Palace were alerted to a man climbing over the south gate.

'As he dropped to the ground he was met by officers and arrested for trespassing on designated site, contrary to Section 128 Serious Organised Crime and Police Act 2005.

Officers met the man as he dropped to the ground and arrested him for trespassing on a designated site, Scotland Yard said

'He was not found in possession of any offensive weapons.

'The 21-year-old man was taken into custody and will undergo a mental health assessment. Enquiries by officers continue.'

A Palace spokesman said: 'We never comment on security, which is a matter for police.'

This is the fifth security alert at the Palace since May.

In August, a Chinese student allegedly tried to smuggle a knife into Buckingham Palace in his shoe and said he wanted to kill the Queen.

Hang Zhang, 25, who is a University of Sheffield student, was sectioned and had a charge of threatening to kill the Queen dropped because of his mental health.

In the same month, a drunk man scaled a fence and spent 14 minutes prowling the grounds.

Denis Hennessy, a convicted murderer, got into the grounds of Buckingham Palace in May and was jailed for four months

The unnamed suspect from Croydon breached the outer perimeter of the palace at 4.15am by climbing a fence with motion sensors and security wire.

He spent 14 minutes wandering around the gardens before being arrested by royal protection officers who spotted him on CCTV.

A Royal fanatic caught outside Buckingham Palace armed with three knives days before the Queen's birthday will be sentenced later this month.

6ft 9ins John Bolton, 47, pleaded guilty to possession of the three lock knives while parked in his car, 100 metres away from the palace on June 9, this year.

Police officers found Bolton under Wellington Arch wearing an army beret with an SAS badge.

He told them he was working for the Queen and Prince Philip and was in the area for five days as a guard.

In May an intruder who sparked a police lock-down at Buckingham Palace when he scaled a 10ft wall was revealed as a convicted murderer.

Denis Hennessy, 41, wandered through the royal gardens for up to ten minutes, before asking armed officers, ‘Is Ma’am in?’

The unemployed Irishman was oblivious to the security alert he had caused as the Queen, Duke of Edinburgh and Duke of York were rushed to safety.

After the drunken trespasser was confronted just 50 yards from the palace, investigators were shocked to discover his past conviction – which saw him jailed for life at the age of 18.

He had bludgeoned homeless man Kevin Cusack to death with a 10in iron bar outside a north London fish and chip shop, in an attack compared to scenes from the ultra-violent film A Clockwork Orange.

After breaking into the Palace he was jailed for four months.

A HISTORY OF BREACHES AT BRITAIN'S MOST ICONIC BUILDING: HOW THE PALACE BECAME A MAGNET FOR PROTESTERS AND ACTIVISTS

In 1982, Michael Fagan got into the Palace and woke the Queen in her bedroom

1982 - Michael Fagan evaded guards to get inside the Queen's private chambers while she was still in bed in 1982. The unemployed father of four, 31, spent around 10 minutes talking to the Queen after he climbed over the palace walls and up a drainpipe. The Queen managed to raise the alarm when Fagan asked for a cigarette, allowing her to call for a footman who held him until police arrived.

July 1992 - Kevin McMahon, 25, was arrested inside the grounds for the second time in a week. During his first sortie, he forced a helicopter carrying the Queen and the Duke of Edinburgh to divert as he roamed the grounds.

1994 - A naked paraglider landed on the roof of Buckingham Palace. American James Miller was fined £200 and deported.

1995 - Student John Gillard rammed the Palace gates in his car at 50mph, tearing one off its hinges.

November 2003 - Daily Mirror journalist Ryan Parry sparked a major alert when he managed to become a footman using false references and infiltrated the workings of the Queen's London home in November 2003.

Parry claimed he was given the chance to get close enough to the Queen to have poisoned her and said no rigorous checks were made into his background. He took pictures of the bed in which US president George Bush and his wife Laura were to sleep during a subsequent state visit.

2012 - Four climate change activists were arrested in 2012 for scaling the Palace gates and chaining themselves to the railings. Two of them held a banner carrying a quote from the Prince of Wales reading: 'The doomsday clock of climate change is ticking ever faster towards midnight. We are simply not reacting quickly enough.'

September 2013 - A man scaled a fence at the Palace and was found in a room that had been open to the public during the day. Another man was arrested outside the Palace. Less than 48 hours after the incident, two police officers confronted the Duke of York in the Palace gardens demanding to know who he was.

2013 - A man with a 6in kitchen knife was rugby-tackled to the ground by police outside the Palace after he jumped over a vehicle barrier in an attempt to see the Queen. David Belmar admitted trespass and possession of a bladed article. The court heard that he wanted to see the Queen because he was unhappy with his benefits.

November 2015 - Activists climbed on the roof of Buckingham Palace in a protest over fathers' rights in November last year. Martin Matthews, 48, and Bobby Smith, 33, used a ladder to breach security after another campaigner caused distraction outside the Palace.

2016 - A musical group claimed to have 'gatecrashed' Buckingham Palace, fooling guests at a private art talk last month. In a video uploaded online, Cat's Eyes said they had previously attempted to get into the Palace to perform a song from their new album. The group said they pretended to be a Renaissance ensemble performing music from that era, when really they gave a live rendition of their own song, We'll be Waiting.